I have a GE Profile Quiet Power Plus GSD4020. When it's done, the base is still filled with water and the dishes are dirty. After reading another thread here, I've removed the piston/nut assy. The rubber gasket seems like it's starting to decompose (gritty) but isn't obviosly damaged. I pressed it closed to see if it can hold water and it does not because there is actually a tiny notch in the plastic body where it makes the seal, which allows water to bypass the gasket. I'm wondering if this is normal or not. Any way to prove/disprove if this piston is not functioning properly?